LM25088: Negative pressure circuit

Meng jeffrey

Part Number: LM25088

I saw a 12V input and -12V output circuit in TI ’s 4k galvanometer reference circuit.
The DCDC used was LM25088. I will consider reducing costs in the future,
It may be necessary to replace the LM25088 with a DCDC with an output current of <0.2A.

Can I replace the LM25088 with any BUCK DCDC with an input voltage above 24V?

over 5 years ago

0 Orlando Murray over 5 years ago

TI__Mastermind 22301 points

Meng,

Can you share the link to the reference circuit? I cannot find it.

I believe you are referring an inverting buck-boost topology, please see following appnotes for guidance

http://www.ti.com/lit/an/slyt286/slyt286.pdf

http://www.ti.com/lit/an/snva856/snva856.pdf

Not every buck converter will work, but WEBENCH will tell you which ones can be used in that topology.

https://webench.ti.com/power-designer/switching-regulator

For a low current example check out PMP7330.

Hope that helps,

-Orlando

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LM25088: Negative pressure circuit